Short answer: the Marshall Kilburn II. It ranks #43 of 105 large speakers by sound quality, rated 3.8/5, at $279. The W-King D9 ranks #91, rated 2.5/5, at $71.24, $207.76 cheaper, which does not close the gap in sound quality.
The Marshall Kilburn II is the better-sounding option. 20W Class D amp + dual 8W tweeters. Watch for: Boosted upper bass, not very detailed, not as deep bass as competitors, upper mids peak.
The W-King D9 is the deeper-bass, longer-running choice. A compact 4.4 lbs (2 kg) boombox with 60W RMS output, a claimed 106dB maximum level, a measured 47Hz -10dB bass point, IPX6 protection, power-bank output, USB-C charging, aux and microSD playback. Its bass reaches about 47Hz before falling 10dB, against 58Hz for the Marshall Kilburn II. It is rated for 40 hours of battery against 20 for the Marshall Kilburn II. It is rated IPX6 against IPX2 for the Marshall Kilburn II. The tradeoff: Treble rolls off early, limiting air and fine detail, while owner reports note Bluetooth interference and some noise at maximum speaker volume.
Buy the Marshall Kilburn II. It is rated higher for sound quality, and the $207.76 you would save on the W-King D9 does not close the gap.
Looking for alternatives? See the complete Portable Bluetooth rankings.
Specifications Side By Side
| Marshall Kilburn II | W-King D9 | |
|---|---|---|
| Price | $279.00 | $71.24 |
| Ranked | #43 of 105 in Large Size Portable Bluetooth Speakers | #91 of 105 in Large Size Portable Bluetooth Speakers |
| Aux Input | Yes | Yes |
| Bass Extension (-10dB) | ~58Hz | 47Hz |
| Battery Life | 20 hours (Manufacturer specified) | 40 hours (Manufacturer specified) |
| IP Rating | IPX2 | IPX6 |
| Weight | 5.5 lbs (2.49 kg) | 4.4 lbs (2.0 kg) |
| App | No | No |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC | SBC |
| Built-in Microphone | Yes | Yes |
| EQ | No | No |
| Party Mode | No | No |
| Power Bank | No | Yes (USB-A) |
| Power Input | USB-C | USB-C |
| Stereo | Yes | Yes |
| Omnidirectional | No | No |
| TWS | Yes | No |
| Amplifier Power | 36W | 60W RMS |
| Dimensions | 9.6” x 6.4” x 5.5” (243 x 162 x 140 mm) | 4.7” x 12.4” x 4.7” (120 x 315 x 120 mm) |
| Drivers | 1x 4” (102mm) woofer + 2x 20mm dome tweeters | 2x 40mm drivers + passive radiators |
| Maximum SPL | 102dB (Manufacturer specified) | 106dB (measured by Alan Ross Reviews) |
| Digital Aux Input | No | No |
| Bluetooth Version | 5.0 | 5.3 |
| Strap | Yes (built-in strap) | No |
| MicroSD Playback | - | Yes |
| Frequency Response | - | 80Hz - 16kHz (Manufacturer specified) |
Related Speaker Comparisons
More top alternatives to Marshall Kilburn II:
- Marshall Kilburn II vs Vifa Helsinki
- JBL Xtreme 5 vs Marshall Kilburn II
- Tribit Stormbox Lava vs Marshall Kilburn II
- Marshall Kilburn II vs Brane X
- Marshall Kilburn II vs Minirig 4 with subwoofer
Prices on this page were last checked October 12, 2026 at 4:13 PM UTC. Product prices and availability are accurate as of that date/time and are subject to change; the price and availability shown on Amazon at the time of purchase will apply to the purchase of this product.
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The Two Speakers In Full
Marshall Kilburn II: $279.00 Amazon $279.00 eBay
Newer model: the Marshall Kilburn III, ranked higher, rated 3.8/5, released May 2025. It adds power bank charging, app control, adjustable EQ and party mode, but drops the built-in mic. Battery life goes from 20 to 50 hours. Water resistance goes from IPX2 to IP54. See every Marshall Portable Speakers generation.
Pros: 20W Class D amp + dual 8W tweeters. 20+ hour battery with quick-charge (20 min charges 3 hours of play). Rugged design with leather handle and reinforced corners, IPX2 rated. Thrives with rock music. Bluetooth 5.0 with 30ft range. Measured bass extension of ~58Hz (-10dB).
Cons: Boosted upper bass, not very detailed, not as deep bass as competitors, upper mids peak. Very low IPX2 water rating. AC charging
Full Marshall Kilburn II review and specifications →
| Released | Aug 2018 (8 years ago) |
|---|---|
| Amplifier Power | 36W |
| App | No |
| Aux Input | Yes |
| Bass Extension (-10dB) | ~58Hz |
| Battery Life | 20 hours (Manufacturer specified) |
| Bluetooth | Yes |
| Bluetooth Codecs | SBC |
| Bluetooth Version | 5.0 |
| Built-in Microphone | Yes |
| Digital Aux Input | No |
| Dimensions | 9.6” x 6.4” x 5.5” (243 x 162 x 140 mm) |
| Drivers | 1x 4” (102mm) woofer + 2x 20mm dome tweeters |
| EQ | No |
| IP Rating | IPX2 |
| Maximum SPL | 102dB (Manufacturer specified) |
| Omnidirectional | No |
| Party Mode | No |
| Power Bank | No |
| Power Input | USB-C |
| Stereo | Yes |
| Strap | Yes (built-in strap) |
| TWS | Yes |
| Weight | 5.5 lbs (2.49 kg) |
- Links
- Reviews, Comparisons and Sound Samples
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W-King D9: $71.24 Amazon $71.24 eBay
Pros: A compact 2kg boombox with 60W RMS output, a claimed 106dB maximum level, a measured 47Hz -10dB bass point, IPX6 protection, power-bank output, USB-C charging, aux and microSD playback. Long-term owners praise its loud, punchy character and useful indoor/outdoor voicing for casual outdoor listening. Measured bass extension of 47Hz (-10dB).
Cons: Treble rolls off early, limiting air and fine detail, while owner reports note Bluetooth interference and some noise at maximum speaker volume. There is no app or adjustable EQ, and its bass does not reach as deep as larger rivals, so it is better suited to energetic background music than neutral listening.
Full W-King D9 review and specifications →
| Released | Dec 2020 (5 years ago) |
|---|---|
| Amplifier Power | 60W RMS |
| App | No |
| Aux Input | Yes |
| Bass Extension (-10dB) | 47Hz |
| Battery Life | 40 hours (Manufacturer specified) |
| Bluetooth | Yes |
| Bluetooth Codecs | SBC |
| Bluetooth Version | 5.3 |
| Built-in Microphone | Yes |
| Digital Aux Input | No |
| Dimensions | 4.7” x 12.4” x 4.7” (120 x 315 x 120 mm) |
| Drivers | 2x 40mm drivers + passive radiators |
| EQ | No |
| Frequency Response | 80Hz - 16kHz (Manufacturer specified) |
| IP Rating | IPX6 |
| Maximum SPL | 106dB (measured by Alan Ross Reviews) |
| MicroSD Playback | Yes |
| Omnidirectional | No |
| Party Mode | No |
| Power Bank | Yes (USB-A) |
| Power Input | USB-C |
| Stereo | Yes |
| Strap | No |
| TWS | No |
| Weight | 4.4 lbs (2.0 kg) |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons